Mesoporous Indium Oxide Catalyst for CO2 Hydrogenation
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Solution Overview
Problem
Current catalysts for converting carbon dioxide to methanol by hydrogenation face challenges in maintaining reactivity and stability due to agglomeration and limited specific surface area, leading to reduced catalytic activity and increased deactivation over time.
Innovation Solution
A mesoporous indium oxide catalyst with Ia3d symmetry and a supported secondary catalyst, such as palladium or cerium oxide, is developed to increase specific surface area and prevent agglomeration, enhancing reactivity and stability through a synergistic effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the specific surface area of the catalyst is increased to improve reactivity, then catalytic activity increases, but catalyst aggregation occurs leading to deactivation
Solution Approach 1:
The patent employs mesoporous indium oxide with a controlled pore structure (pore size 3-10 nm, specific surface area 50-200 m²/g) to increase the catalytic surface area while the porous architecture prevents particle aggregation. The mesoporous structure provides internal surface area for catalysis while maintaining structural integrity and preventing deactivation through aggregation.
Solution Approach 2:
The patent creates a composite catalyst system combining indium oxide with a secondary catalyst (such as Pd, Pt, or other metal oxides) supported on the mesoporous indium oxide surface. This composite structure enhances catalytic activity through synergistic effects while the mesoporous support maintains dispersion and prevents aggregation of the secondary catalyst particles.
2Productivity
If additional catalyst is added to increase reactivity, then catalytic activity increases, but deactivation occurs due to aggregation
Solution Approach 1:
The mesoporous structure with controlled pore size (3-10 nm) accommodates additional catalyst materials within the pore network, distributing them throughout the three-dimensional structure. This prevents aggregation by maintaining physical separation through the porous matrix while providing extensive surface area for catalytic reactions, thereby extending catalyst lifetime.
Solution Approach 2:
The secondary catalyst is nested within or on the surface of the mesoporous indium oxide structure. The hierarchical pore system allows the secondary catalyst to be distributed throughout the mesoporous network, with the indium oxide providing structural support and preventing aggregation of the nested catalyst particles, thus maintaining activity over time.
3Reliability
If the catalyst surface area is increased to prevent aggregation, then stability improves, but reactivity may be compromised
Solution Approach 1:
The mesoporous indium oxide structure resolves this contradiction by providing high specific surface area (50-200 m²/g) through its porous architecture rather than by increasing particle size. The pores with diameters of 3-10 nm create extensive internal surface area for catalysis while the porous network prevents aggregation, simultaneously achieving both high reactivity and stability.
Solution Approach 2:
The catalyst design transitions from a two-dimensional surface to a three-dimensional mesoporous structure. The vertical pore network provides additional surface area in the third dimension, allowing high catalytic efficiency without increasing lateral particle size that would lead to aggregation. This dimensional approach maintains stability while enhancing reactivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mesoporous indium oxide catalyst with a secondary catalyst significantly improves carbon dioxide conversion rates and methanol selectivity, maintaining stability and activity over extended periods, outperforming traditional bulk indium oxide catalysts.
Implementation Method 1
Catalyst for conversion of carbon dioxide to methanol by hydrogenation
Implementation Method 2
increase a mesoporous structure to increase a specific surface area
Data Source
AI summary
Disclosed are a catalyst used for converting carbon dioxide to methanol by hydrogenation and a method preparing the sane. The caratlys may include: a mesoporous indium oxide; and a catalyst supported on the mesoporous indium oxide. Preferably, a porous structure of the mesoporous indium oxide may have Ia3d symmetry and may include mesopores and micropores interconnecting the mesopores.